After gastric bypass surgery, diet is crucial for the healing process and the long-term success of weight loss. Dietary fibre plays an important role in this, as it promotes digestion and ensures a longer-lasting feeling of satiety. Glucomannan, a soluble dietary fibre from the konjac root, is known for its ability to increase satiety and stabilise blood sugar levels. But how safe is it to take glucomannan after a gastric bypass?

Recommended fibre intake after gastric bypass surgery

After bariatric surgery, it is recommended that the intake of dietary fibre be increased gradually to prevent constipation and support bowel health. In particular, soluble fibres, such as those found in fruit, vegetables and certain dietary supplements, should be favoured. Adequate fluid intake is essential to support the swelling capacity of dietary fibres and to prevent digestive problems.

Glucomannan and its effect

Glucomannan is characterised by its high water-binding capacity and can absorb up to 50 times its own weight in water. This leads to an increase in volume in the stomach, which increases the feeling of satiety. In addition, glucomannan can help to reduce post-prandial blood sugar spikes, which can be particularly beneficial for patients who have had gastric surgery. (https://pmc.ncbi.nlm.nih.gov/articles/PMC1433766/)

The fear that glucomannan can expand the stomach again is not due to the glucomannan, which rather provides a sense of satiety, but rather to the rashly increasing amount of food. In addition, we see no problems in practice with the digestion of such patients.

Safety of glucomannan intake after gastric reduction

Studies have shown that taking glucomannan can have positive effects in patients after bariatric surgery, for example in the prevention of dumping syndrome. However, caution is advised: with insufficient fluid intake, glucomannan can cause constipation or even intestinal obstruction. It is therefore essential to always take glucomannan with sufficient water. However, this applies independently of the bariatric procedure. In general, you should always ensure that you drink enough fluids.

Dosage and pharmaceutical form

The recommended dosage of glucomannan is often around 1 gram per serving, with each dose taken with at least 1–2 glasses of water. Due to the swelling capacity of the powder, taking it in capsule form can be problematic, as the capsules may not disintegrate in the stomach in time, thus delaying the swelling. Therefore, it is often recommended to take glucomannan in powder form, which is dissolved in sufficient liquid.

Conclusion

Taking glucomannan after gastric bypass surgery can be safe if the correct dosage is taken and sufficient fluids are consumed. It can even offer advantages such as increased satiation and the prevention of dumping syndrome. However, it is important to monitor how your body tolerates the fibres and to consult your doctor or dietician if you are unsure.